Caveat: I've never worked with a 3805. I do have a 380. I'm assuming they
are close.
If the gps hasn't been turned on in a while, it will need to download a new
ephemeris. With the new ephemeris, it can find it position much faster
because it will know pretty close where the satellites
Bob,
everything you need for the Z3805 is included in my Z38XX utility, that has
already been mentioned. This includes sending commands to the receiver, you
do not need another terminal program. I own a Z3805 myself and basically I
have written the software for myself. A Z3801 manual in
Hi
The lower connector on the 3805 is the command port that appears to have the
422 / 232 option jumpers associated with it.
The upper connector looks like it's only wired for RS-232 . It's connected to
the lower board in the unit. What's it for?
Bob
On May 22, 2010, at 5:50 AM, Ulrich
Hi Ulrich,
Thank you for your response. I hope to try it today if I can get away from household duties. Will I need to leave the
computer hooked up, or will it run stand alone once I set it up?
Thanks,
Bob
- Original Message -
From: Ulrich Bangert df...@ulrich-bangert.de
To:
Hi All,
I hooked everything up and I still get nothing. I can't seem to establish communications with the Z3805. I tried a
null modem as well, in case the cable (supplied) was wired with the wrong connector gender. I see a green blinking
light inside, it he left rear corner of the box.
When all else fails, get out the voltmeter.
Do you have power to the antenna? Is it the right voltage? All the way to
the antenna?
What volts are on pins 2 or 3 relative to pin 7 in the comm connector?
If you see 12 volts, that's RS-422. You may have burned out your computer's
serial port.
If
Have you looked at the serial connector with an oscilloscope? Pin 2 should
be the output data. Pin 3 is for data going into the GPS. And pin 7 is
ground. I use Z3801A systems which have a 25-pin connector. Other systems
use a 9-pin serial connector. The only difference should be the
Bill, I think you got it backwards. +/- 12V is typical for RS-232, 0/+5V is
for RS-422 and RS-485.
No RS-232 receiver should be damaged with +/- 12V or even +/- 15V because
that is their normal operating voltage.
Also, RS-422 and RS-485 have something like 25V common mode tolerance (not
sure
Didier Juges wrote:
Bill, I think you got it backwards. +/- 12V is typical for RS-232, 0/+5V is
for RS-422 and RS-485.
No RS-232 receiver should be damaged with +/- 12V or even +/- 15V because
that is their normal operating voltage.
Also, RS-422 and RS-485 have something like 25V common mode
Point of clarification, on a PC RS-232 port, expect to find TxD (output) on
pin 2 of a 25-pin D-sub, and on pin 3 of on a 9-pin D-sub.
This is a sign of terminal configuration (DTE), and a PC is conventionally a
terminal. It would be surprising if your PC isn't.
If you don't have a scope, a dc
Bruce,
Thanks for the additional information.
+/- 14V is quite unusually low in my experience. I typically use Maxim parts
such as the MAX220 series, which is specified at +/-25V for no damage on the
inputs (some parts in that series go to +/-30V).
The bottom line is that as I pointed out
Was there ever a standard? I always thought the RS stood for
Recommended Standard, as in you *should* do the following as
compared to you shall do the following I've seen inverted TTL talk
to the RS232 port on laptops and I even sometimes use the max233's
(+/- 10 volts instead of 12), but always
Yes, there is a standard and I have an original copy. It is an EIA standard
for 422A, 423A, 232C, 449. It was published in 1984. Some of the actual
standards within the large document go back to the early 70's. Regards -
Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
Did not seem to find it???
On Tue, May 18, 2010 at 11:54 PM, normn3...@stny.rr.com wrote:
Hi all!
Just uploaded the 5087a manual to ko4bb's site. Bad news is it's 50mb. Good
news is that you can read the schematics. Colleen enthusiastically scanned
the wide pages for me at the highest res.
Paul,
Check with ko4bb. If you'd like, I'll send you a copy in pieces. What's your
isp's attachment size limit.
Norm n3ykf
paul swed paulsw...@gmail.com wrote:
Did not seem to find it???
On Tue, May 18, 2010 at 11:54 PM, normn3...@stny.rr.com wrote:
Hi all!
Just uploaded the 5087a
At 09:47 PM 5/22/2010, Robert Darlington wrote...
Was there ever a standard? I always thought the RS stood for
Recommended Standard, as in you *should* do the following as
Recommended Standard, and is this is a standard which is recommended
for use.
The latest standard I've seen is
Hi
In this case the RS relates to Radio Shack ..
Not a lot of standardization in the RS-232 world. Take a look at the slew rate
limiting requirements in the original document ...
Bob
On May 22, 2010, at 9:47 PM, Robert Darlington wrote:
Was there ever a standard? I always thought the
Thank you all for these inputs!
Most importantly, the big question is: Regardless of RS-232 or 422, will the unit do ANYTHING without communications?
Do I need a computer to get anything beyond the power led?
I bought this at the Dayton convention ham flea market, and the guy told me it was
Mike S wrote:
At 09:47 PM 5/22/2010, Robert Darlington wrote...
Was there ever a standard? I always thought the RS stood for
Recommended Standard, as in you *should* do the following as
Recommended Standard, and is this is a standard which is recommended
for use.
The latest standard I've
Bob,
I have two Z3805A's. One is 1998 HP and one is a 2004 Symmetricom.
The older HP took a VERY LONG TIME to complete site survey.
Both use 24V power.
Both are also RS-232 on lower connector. (even though it says 422 on the
boards)
Use null modem cable (only three wires needed if you make
Do I need a computer to enable this thing?
I expect you need a computer to tell it to take a survey. Once that works,
you don't need a computer if you don't change the location. (It's actually
the antenna location that matters. You can move the unit around in your lab.)
You probably want
Bob,
For the sake of propriety please don't propagate myths. The RS- series of
standards predate Radio Shack. The wiki at the following address has a good
write-up about it:
http://en.wikipedia.org/wiki/RS-232
And, yes it is standardized. Although many have abused it.
BillWB6BNQ
Bob
Bob - I have a Symmetricom/HP Z3805. When I first got it I powered it up in the
North end if my house, where car GPS's can't lock, left it on for a day or more,
and it locked. No computer involved. The antenna is a MA/COM mag mount from
1997.
I bought the unit from fluke.l on ebay from China.
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